Composition for laser marking
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1999
filing date -
Sep 29, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A resin composition having laser marking properties comprising a polycarbonate resin, an effective amount of a copper chromite having a spinel structure and up to 0.05% by weight of the total composition of carbon black, wherein said polycarbonate resin foams in laser struck areas to form light colored markings in the laser struck areas on a dark background.
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